From: Steven Rostedt <rostedt@goodmis.org>
To: Mike Rapoport <rppt@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Andreas Larsson <andreas@gaisler.com>,
Andy Lutomirski <luto@kernel.org>,
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Johannes Berg <johannes@sipsolutions.net>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
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Subject: Re: [PATCH v7 0/8] x86/module: use large ROX pages for text allocations
Date: Mon, 18 Nov 2024 13:25:01 -0500 [thread overview]
Message-ID: <20241118132501.4eddb46c@gandalf.local.home> (raw)
In-Reply-To: <20241023162711.2579610-1-rppt@kernel.org>
On Wed, 23 Oct 2024 19:27:03 +0300
Mike Rapoport <rppt@kernel.org> wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
>
> Hi,
>
> This is an updated version of execmem ROX caches.
>
FYI, I booted a kernel before and after applying these patches with my
change:
https://lore.kernel.org/20241017113105.1edfa943@gandalf.local.home
Before these patches:
# cat /sys/kernel/tracing/dyn_ftrace_total_info
57695 pages:231 groups: 9
ftrace boot update time = 14733459 (ns)
ftrace module total update time = 449016 (ns)
After:
# cat /sys/kernel/tracing/dyn_ftrace_total_info
57708 pages:231 groups: 9
ftrace boot update time = 47195374 (ns)
ftrace module total update time = 592080 (ns)
Which caused boot time to slowdown by over 30ms. That may not seem like
much, but we are very concerned about boot time and are fighting every ms
we can get.
-- Steve
next prev parent reply other threads:[~2024-11-18 18:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-23 16:27 [PATCH v7 0/8] x86/module: use large ROX pages for text allocations Mike Rapoport
2024-10-23 16:27 ` [PATCH v7 1/8] mm: vmalloc: group declarations depending on CONFIG_MMU together Mike Rapoport
2024-10-23 16:27 ` [PATCH v7 2/8] mm: vmalloc: don't account for number of nodes for HUGE_VMAP allocations Mike Rapoport
2024-10-23 16:27 ` [PATCH v7 3/8] asm-generic: introduce text-patching.h Mike Rapoport
2024-10-23 16:27 ` [PATCH v7 4/8] module: prepare to handle ROX allocations for text Mike Rapoport
2024-10-23 16:27 ` [PATCH v7 5/8] arch: introduce set_direct_map_valid_noflush() Mike Rapoport
2024-10-23 16:27 ` [PATCH v7 6/8] x86/module: prepare module loading for ROX allocations of text Mike Rapoport
2024-11-04 23:27 ` Nathan Chancellor
2024-11-05 7:02 ` Mike Rapoport
2024-11-05 19:04 ` Nathan Chancellor
2024-10-23 16:27 ` [PATCH v7 7/8] execmem: add support for cache of large ROX pages Mike Rapoport
2025-02-27 11:13 ` Ryan Roberts
2025-02-28 13:55 ` Mike Rapoport
2024-10-23 16:27 ` [PATCH v7 8/8] x86/module: enable ROX caches for module text on 64 bit Mike Rapoport
2024-11-18 18:25 ` Steven Rostedt [this message]
2024-11-18 18:40 ` [PATCH v7 0/8] x86/module: use large ROX pages for text allocations Mike Rapoport
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